A drilling tool three-proofing safety lifting control method and device

Abstract

The application relates to the technical field of oil well control, and discloses a drilling tool three-proof safety lifting control method and device. The method detects and judges the state of a blowout preventer brake and the state of a wellhead in a well closing process and a well opening process in real time, and then starts a brake in time. The brake control gas path is controlled according to the size of a hanging weight value after the well is closed and before the well is opened, safety accidents such as drilling tool fracture or damage of a blowout preventer brake caused by lifting of the drilling tool are prevented, and the work efficiency of a well team on site can be improved.

Description

Technical Field

[0001] This application relates to the field of oil well control technology, specifically to a method and device for drilling tool safety lifting control. Background Technology

[0002] In the field of oil well control, a semi-sealed gate blowout preventer and safety device are installed at the wellhead. The air circuit is disconnected through the control valve of the safety device to control the reset of the high and low speed clutches of the winch, preventing air from entering the pressure regulating valve. The high and low speed clutches cannot be engaged, and the traveling block hook cannot be lifted, thereby achieving the purpose of preventing the drill string from being snapped off when it is lifted to the semi-sealed gate.

[0003] Currently, most drill string safety lifting control devices used on-site during drilling operations cannot detect the well shut-in or well opening processes. Therefore, if operators mistakenly lift the drill string during well opening or shut-in, it could cause a safety accident. Furthermore, existing drill string safety lifting control devices remain in a braked state after the wellhead is closed, preventing the traveling block from starting. However, the drilling team needs to start the traveling block to move small-tonnage drill strings at this time. Therefore, existing drill string safety lifting control devices do not adequately meet the needs of the drilling team's on-site work. In summary, the drill string safety lifting control devices currently used on-site not only pose certain safety hazards but also reduce on-site work efficiency.

[0004] The patent with publication number CN207033398U discloses a hydraulic blowout preventer safety device. This device is in a braking state after the wellhead is closed and the traveling block cannot be started. However, the drilling team needs to use the traveling block with a small tonnage to change drilling tools on site. At this time, the operator will manually disconnect the brake source to release the braking state, which poses a significant safety hazard.

[0005] For example, patent CN212317964U discloses a drilling anti-blowout control device. This patent cannot perform detection during wellhead closure and wellhead opening, meaning it cannot prevent the drilling tool from being lifted during braking. If the blowout preventer gate is not fully closed or the wellhead is not fully open, lifting the drilling tool at this time may cause damage to the drilling tool or partial sealing of the gate, or even breakage of the drilling tool, resulting in unnecessary downhole accidents. Summary of the Invention

[0006] To address the problems and shortcomings of the existing technologies, this application proposes a drilling tool safety lifting control method and device. By real-time detection and judgment of the blowout preventer gate status and wellhead status during the well shut-in and well opening processes, the brakes are activated in a timely manner to prevent drilling tool breakage or blowout preventer gate damage during lifting, and also to improve the on-site work efficiency of the drilling team.

[0007] To achieve the aforementioned objectives, the technical solution of this application is as follows:

[0008] A method for controlling the safety of drilling tools under three-proof conditions includes the following steps:

[0009] Step S1. Power on the control system and load the operating parameters. The system monitors and acquires data from the hydraulic sensors and oil quantity sensors in the blowout preventer control oil circuit in real time.

[0010] Step S2. When the blowout preventer (BOP) begins to close, hydraulic oil in the hydraulic station flows into the BOP control circuit, and then flows through the hydraulic sensor and oil quantity sensor in the circuit to the BOP cylinder. The oil quantity sensor in the circuit rotates forward, and the control system receives the pulse signal transmitted by the oil quantity sensor. Based on the pulse signal, the control system calculates the flow rate of hydraulic oil in the BOP control circuit and determines whether it is a valid signal. When the signal is valid, the control system opens the air source solenoid valve on the brake control air circuit. At this time, the brake control air circuit is opened, and the brake control air circuit is connected to the compressed air source. Compressed air enters the traveling block brake device, and the traveling block is locked. The control system also outputs a brake indication. When the signal transmitted by the oil quantity sensor does not change, the control system closes the air source solenoid valve. At this time, the brake control air circuit is cut off. The control system simultaneously opens the exhaust solenoid valve on the brake control air circuit to discharge the residual compressed air in the pipeline, release the traveling block brake, and finally the control system records the current shut-in flow rate data.

[0011] Step S3. The control system continuously collects the suspended weight value. If the currently collected suspended weight value is greater than the reference tonnage, the control system opens the air source solenoid valve to connect the brake control air circuit. The brake control air circuit is connected to the air source to brake the traveling carriage. The control system outputs a brake indication at the same time. If the currently collected suspended weight value is less than the reference tonnage, the control system closes the air source solenoid valve to cut off the brake control air circuit and opens the exhaust solenoid valve on the brake control air circuit to discharge the residual compressed air in the pipeline. The traveling carriage brake is released.

[0012] Step S4. When the blowout preventer begins to open, the hydraulic oil in the blowout preventer cylinder flows back to the hydraulic station through the blowout preventer control oil circuit. The oil quantity sensor in the oil circuit reverses, and the control system receives the pulse signal transmitted by the oil quantity sensor.

[0013] The system calculates the hydraulic oil flow rate in the oil circuit based on the received signal and determines whether the signal is valid. When the signal is valid, the control system opens the air source solenoid valve in the brake control air circuit to connect the air source. At this time, the brake control air circuit is open, and compressed gas enters the traveling block brake device, locking the traveling block. When the signal transmitted by the oil quantity sensor remains unchanged, the system records the current well opening flow rate data. The control system compares the difference between the current well opening flow rate data and the previous well opening flow rate data to see if it is less than the error reference value δ. If the difference is less than the error reference value δ, the control system determines that the blowout preventer (BOP) has been fully opened, closes the air source solenoid valve to cut off the brake control air circuit, and simultaneously opens the exhaust solenoid valve in the brake control air circuit to discharge the residual compressed air in the pipeline. The traveling block brake is released, and the control system sets the well opening flag F for this group of BOPs. If the difference is greater than the error reference value δ, the control system determines that the BOP has not been opened. The control system outputs an alarm message and keeps the air source solenoid valve closed until the operator manually troubleshoots the fault, opens the BOP, and clears the alarm. Then, the well opening flag F for this group of BOPs is set.

[0014] Step S5. The control system determines whether both sets of blowout preventers have been opened based on the two sets of blowout preventer open well flags F. If yes, return to step S1; otherwise, return to step S3.

[0015] Preferably, the control system continuously collects the suspended weight value during operation. If no suspended weight value signal is collected or the suspended weight value exceeds 1000 tons, the control system outputs a suspended weight sensor fault signal.

[0016] Preferably, the brake control air circuit is also equipped with a pressure sensor. When the control system controls the air source solenoid valve in the brake control air circuit to open and connect the air source, if the pressure sensor does not send a signal to the control system, the control system determines that the air source solenoid valve is faulty and outputs a corresponding air source solenoid valve fault signal.

[0017] Preferably, if the control system detects a signal input from the hydraulic sensor but no signal from the oil quantity sensor within 10 seconds of powering on, the control system directly switches to operation step S3 to collect the suspended weight value and determine whether the traveling carriage needs to be braked based on the suspended weight value.

[0018] Preferably, 10 seconds after the control system is powered on, if a signal is detected from the hydraulic sensor but no signal is detected from the oil quantity sensor, the control system directly opens the air source solenoid valve to connect the air source, and compressed gas enters the braking device. At the same time, the control system outputs an oil quantity sensor fault signal.

[0019] Preferably, after well shut-in, if the control system detects a signal input from the oil level sensor but cannot confirm whether it is forward or reverse rotation, the control system determines that the oil level sensor is faulty and outputs a fault signal. Simultaneously, the control system directly opens the gas source solenoid valve to connect the gas source, allowing compressed gas to enter the braking device. After receiving the fault signal from the control system, the operator manually troubleshoots the problem. Once the fault is resolved, the control system releases the traveling block brake.

[0020] Preferably, the method for determining the valid signal is as follows: if, within a certain time period, the control system calculates that the oil quantity data in the oil circuit has not reached the set threshold based on the signal transmitted by the oil quantity sensor, then the signal transmitted by the oil quantity sensor is considered an invalid signal; if the control system calculates that the oil quantity data in the oil circuit exceeds the set threshold based on the signal transmitted by the oil quantity sensor, then the signal transmitted by the oil quantity sensor is considered a valid signal.

[0021] Based on the same inventive concept, this invention also proposes a drill string three-proof safety lifting control device. The device is used to implement the lifting control method described above. The device mainly includes a control system and a suspension sensor, a hydraulic sensor, an oil quantity sensor, an air source solenoid valve, an exhaust solenoid valve, and an air pressure sensor, which are respectively connected to the control system. The suspension sensor is installed at the pressure transmission bag at the dead rope head of the derrick. The hydraulic sensor and the oil quantity sensor are sequentially installed in the blowout preventer control oil circuit between the hydraulic station and the blowout preventer. The air source solenoid valve, the exhaust solenoid valve, and the air pressure sensor are sequentially installed in the brake control air circuit between the air source and the brake device.

[0022] Preferably, the control system is integrated in a control box, and the control box panel is equipped with a touch-screen human-machine interface display.

[0023] Preferably, a three-color indicator light is also included, which is connected to the control system.

[0024] The beneficial effects of this application are:

[0025] (1) This application uses real-time detection to judge the well shut-in process, well opening process, and wellhead status, and then promptly activates the brake to prevent safety accidents such as drill string breakage or blowout preventer gate damage caused by hoisting the drill string; furthermore, after the wellhead is closed, the hoisting weight value is tracked in real time. When the hoisting weight value is greater than the set tonnage, the solenoid valve is activated in time to connect the gas source for braking; when the hoisting weight value is lower than the set tonnage, the gas source is disconnected to release the brake. This application effectively avoids the occurrence of safety accidents and improves the production efficiency of the drilling team.

[0026] (2) This application uses a hydraulic sensor and an oil quantity sensor to detect the wellhead status, which improves the accuracy of detection. At the same time, the hydraulic sensor can also accurately determine the wellhead status when the wellhead is closed, the control system is powered on, or the oil quantity sensor is lost. Through the above dual detection, the well team can accurately detect and judge the wellhead status under various extreme conditions.

[0027] (3) The gas source solenoid valve of this application adopts a direct-acting normally closed solenoid valve, which has the characteristics of fast response speed and long service life. Therefore, the braking response time is shortened, the braking device responds faster, and the occurrence of safety accidents is reduced.

[0028] (4) In this application, an exhaust solenoid valve is installed between the gas source solenoid valve and the braking device. Its function is to automatically remove the remaining gas in the pipeline and release the brake in a timely manner after the gas source solenoid valve is closed. Compared with the currently widely used manual exhaust device, the exhaust solenoid valve of this application is automatically controlled by the control system to release the brake without manual intervention. This avoids the problem that it is not conducive to production operations to manually determine whether the traveling block can be used and then manually remove the remaining high-pressure gas to release the brake, as well as the problem that production personnel may accidentally manually start the exhaust device during normal braking and thus release the brake, causing a safety accident caused by lifting the drill bit.

[0029] (5) In this application, a pressure sensor is configured between the air source solenoid valve and the brake device. Its function is to detect and determine whether the brake has been applied after the air source solenoid valve is opened to connect the air source and start the brake. If the brake cannot be applied due to damage to the air source solenoid valve or other reasons such as no air source, the sensor can promptly alarm and remind the operator to eliminate the cause of the inability to brake, so as to avoid unnecessary safety accidents.

[0030] (6) In this application, the control system is equipped with a three-color indicator light. The green light indicates that the power is on, the yellow light indicates that the wellhead is currently closed, the red light indicates that it is currently in a braking state, and the red, yellow and green lights flashing at the same time indicate that there is an alarm fault that needs to be dealt with. This makes it easy for the well team operators to remotely understand the current wellhead status and take appropriate action in a timely manner.

[0031] (7) In this application, the control box panel is equipped with a touch-screen human-machine interface display. On-site operators can understand the current wellhead status, check whether the gas source solenoid valve is operating normally and verify the lifting weight value through the display. At the same time, alarm information and data such as power-on time, power-off time, well shut-in time, well open time, braking time, and release time are recorded for easy traceability and query. Attached Figure Description

[0032] The foregoing and hereinafter detailed description of this application becomes clearer when read in conjunction with the following figures, in which:

[0033] Figure 1 This is a schematic diagram of the device structure of this application.

[0034] In the picture:

[0035] 1. Control box; 2. Suspension sensor; 3. Hydraulic sensor; 4. Oil quantity sensor; 5. Air source solenoid valve; 6. Exhaust solenoid valve; 7. Air pressure sensor; 8. Blowout preventer control oil circuit; 9. Brake control air circuit; 10. Human-machine interface display; 11. Three-color indicator light. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this application, the following will further illustrate the technical solutions for achieving the inventive objectives of this application through several specific embodiments. It should be noted that the technical solutions claimed in this application include, but are not limited to, the following embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of this application.

[0037] Currently, most drill string safety lifting control devices used on-site during drilling cannot detect the well shut-in or well opening process. Therefore, if operators mistakenly lift the drill string during well opening or shut-in, it could cause a safety accident. Furthermore, existing drill string safety lifting control devices remain in a braked state after the wellhead is closed, preventing the traveling block from starting. However, the drilling team needs to start the traveling block to move small-tonnage drill strings at this time. Therefore, existing drill string safety lifting control devices cannot adequately meet the needs of the drilling team's on-site operations.

[0038] In summary, the drill string safety lifting control devices currently used at drilling sites not only pose certain safety hazards but also reduce on-site work efficiency.

[0039] Based on this, embodiments of this application propose a drill string safety hoisting control method and device. This solution detects and judges the status of the blowout preventer and the wellhead during the shut-in and well-opening processes in real time, and then promptly activates the brakes to prevent drill string breakage or damage to the blowout preventer gate caused by hoisting the drill string. Furthermore, after the wellhead is closed, the hoisting weight value is tracked in real time. If the hoisting weight value is greater than the set tonnage, the solenoid valve is activated to connect the gas supply and brake the traveling block. If the hoisting weight value is lower than the set tonnage, the gas supply is disconnected to release the traveling block brake. This effectively avoids safety accidents and improves the production efficiency of the drilling team.

[0040] To facilitate understanding of the proposed solution, this implementation first provides a detailed explanation and introduction of a drilling tool three-proof safety lifting control method.

[0041] First, it should be noted that in this embodiment, the blowout preventer (BOP) actually has two control oil circuits: one is the upper half-sealing control oil circuit, and the other is the lower half-sealing control oil circuit. Each of the two half-sealing control oil circuits corresponds to a gate valve, used to open or close the gate valves. Both half-sealing control oil circuits are connected to the same hydraulic station and are supplied with oil by the same hydraulic station. The two half-sealing control oil circuits do not receive oil simultaneously; they receive or return oil in a sequential order. That is, the opening and closing of the two gate valves of the BOP are performed sequentially, but the entire operation process and judgment logic are exactly the same, both performing the following well shut-in or well opening operations.

[0042] It should also be noted that in this embodiment, the blowout preventer (BOP) closing corresponds to well shut-in, and the BOP opening corresponds to well open. Furthermore, as long as one of the gates in the BOP is closed, the wellhead is in the shut-in state; when only one gate of the BOP is closed, only one gate needs to be opened during well opening, and the wellhead is in the open state after that gate is fully opened; when both gates of the BOP are closed, the wellhead is only in the open state after both gates are fully opened.

[0043] Therefore, this embodiment takes the upper semi-sealed control oil circuit as an example to explain and illustrate the drilling tool three-proof safety lifting control method, as detailed below.

[0044] This embodiment discloses a method for safe lifting and control of drill bits under three-proof conditions, as detailed in the appendix to the instruction manual. Figure 1 The method mainly includes the following steps:

[0045] Step S1. Power on the control system and load the operating parameters. The green indicator light indicates that the current control system is operating normally. The system monitors and acquires data from the hydraulic sensors and oil quantity sensors in the upper semi-sealed control oil circuit in real time.

[0046] In this embodiment, the control system is the center of the entire control logic, and both the upper and lower semi-sealed control oil circuits are controlled and regulated by the control system.

[0047] Step S2. When the blowout preventer gate corresponding to the upper half-sealing control oil circuit begins to close, the hydraulic oil in the hydraulic station flows into the upper half-sealing control oil circuit, and finally flows into the blowout preventer cylinder through the hydraulic sensor and oil quantity sensor installed in the oil circuit. At this time, the blowout preventer is in the oil inlet state. When oil is inlet, the oil quantity sensor in the oil circuit rotates forward. The control system receives the pulse signal transmitted by the oil quantity sensor, calculates the flow rate of hydraulic oil in the blowout preventer control oil circuit at this time based on the pulse signal, and determines whether it is a valid signal. When the signal is a valid signal, the control system opens the air source solenoid valve on the brake control air circuit, the brake control air circuit is connected to the air source, compressed air enters the traveling block brake device, the traveling block is locked, and the control system outputs a brake indication. When the signal transmitted by the oil quantity sensor does not change, the control system closes the air source solenoid valve and opens the exhaust solenoid valve on the brake control air circuit to discharge the residual compressed air in the pipeline, release the brake, and finally the control system records the current shut-in flow rate data.

[0048] In this embodiment, the car being locked means that the car is braked and is in a braking state.

[0049] In this embodiment, it should be noted that the lower half-sealing control circuit of the blowout preventer will also execute the shut-in judgment logic of step S2 above when shutting in the well. The two are exactly the same, only in order. The specific control process of the lower half-sealing control circuit of the blowout preventer will not be described in detail here.

[0050] Since both semi-sealed control circuits of the blowout preventer execute the shut-in judgment logic of step S2 above during well shut-in, each semi-sealed control circuit has its own shut-in flow rate data. During well shut-in, as long as the flow rate signal transmitted by the oil quantity sensor in one semi-sealed control circuit is a valid signal, it indicates that the blowout preventer is closed and the wellhead is in a shut-in state. At this time, the brake control air circuit will start working to lock the traveling block.

[0051] In this embodiment, it should also be noted that the control system outputs braking indications, including illuminating a red indicator light and displaying the vehicle as braked on the interactive human-machine interface.

[0052] In this embodiment, it should be further explained that the method for determining whether the signal from the fuel level sensor is a valid signal is as follows:

[0053] The timing is activated. Within a certain time period, such as 5 seconds, if the control system calculates the oil level in the oil circuit based on the pulse signal transmitted by the oil level sensor and finds that the oil level has not reached a set threshold (e.g., less than 50 ml), then the signal transmitted by the oil level sensor is considered invalid. Conversely, if the control system calculates that the oil level in the oil circuit exceeds 50 ml within 5 seconds based on the pulse signal transmitted by the oil level sensor, then the signal transmitted by the oil level sensor is considered valid. In other words, determining whether a signal is valid essentially means determining whether the hydraulic oil flow rate in the oil circuit meets the requirements per unit time.

[0054] In this embodiment, "no change in the signal transmitted by the oil quantity sensor" means that within a certain period of time, such as 2 seconds, the control system calculates that the oil quantity data in the control oil circuit has not increased or decreased based on the pulse signal transmitted by the oil quantity sensor.

[0055] In this embodiment, the current shut-in flow rate data refers to the amount of hydraulic oil in the control circuit when the blowout preventer is closed.

[0056] In this embodiment, the oil quantity sensor includes a magnet mounted on the rotating shaft of the hydraulic motor and four Hall effect sensors installed in the control oil circuit to cooperate with the magnet. Each rotation of the hydraulic motor generates four pulse signals, thus the direction of rotation of the shaft (clockwise or counterclockwise) can be determined based on the Hall effect sensor signals. In this embodiment, clockwise rotation corresponds to oil inflow into the control oil circuit, and counterclockwise rotation corresponds to oil return. The flow rate can be calculated from the number of rotations of the oil quantity sensor per unit time, and the flow rate of the hydraulic oil in the oil circuit can be determined by combining this with the diameter of the oil circuit.

[0057] Step S3. After the wellhead is closed, the control system will control the suspended weight sensor to continuously collect the suspended weight value. If it is determined that the currently collected suspended weight value is greater than the reference tonnage, the control system will directly open the gas source solenoid valve to connect the gas source and force the traveling block to brake to prevent the drill string from breaking, and output a brake indication; if it is determined that the currently collected suspended weight value is less than the reference tonnage, the control system will cut off the brake control gas path, the gas path is in a disconnected and non-working state, no compressed air enters the brake device, and the traveling block brake is released.

[0058] In this embodiment, it should be noted that the size of the reference tonnage can be set according to one's own needs.

[0059] In this implementation, if the control system fails to collect the suspended weight signal or the suspended weight exceeds 1000 tons, the control system determines that the suspended weight sensor is faulty, and the control system will output a suspended weight sensor fault signal to the on-site operator accordingly.

[0060] Step S4. When the blowout preventer (BOP) begins to open, the hydraulic oil in the BOP cylinder flows back to the hydraulic station through the upper half-seal control oil circuit of the BOP. At this time, the control oil circuit is in the return oil state. When the control oil circuit returns oil, the oil quantity sensor in the oil circuit reverses. The control system receives the pulse signal transmitted by the oil quantity sensor, and then calculates the flow rate of the hydraulic oil in the oil circuit at this time based on the received signal and determines whether it is a valid signal. When the signal is a valid signal, the control system opens the air source solenoid valve in the brake control air circuit to connect the air source. The brake air circuit is opened, and compressed gas enters the traveling block brake device, locking the traveling block. When the signal transmitted by the oil quantity sensor no longer changes, the current well opening flow rate data is recorded, and the control system compares the current well opening flow rate data. If the difference between the flow rate data and the previous shut-in flow rate data is less than the error reference value δ, the control system determines that the blowout preventer (BOP) is fully open, closes the gas source solenoid valve to cut off the brake control air circuit, and simultaneously opens the exhaust solenoid valve on the brake control air circuit to discharge the residual compressed air in the pipeline. The traveling block brake is released, and the control system sets the BOP open well flag F for this group. If the difference is greater than the error reference value δ, the control system determines that the BOP is not open, outputs an alarm message, and keeps the gas source solenoid valve closed until the operator troubleshoots the problem, manually opens the BOP, and clears the alarm. Then, the control system sets the BOP open well flag F for this group.

[0061] In this implementation, it should be noted that when shutting in the well, if only one gate of the blowout preventer is closed, then only one gate needs to be opened when opening the well in step S4. Therefore, to determine whether the blowout preventer is fully open, it is only necessary to compare whether the well opening flow rate data and the well shut-in flow rate data corresponding to the gate control circuit are consistent. When they are consistent, it means that the wellhead is open and the well is in the open state. However, when shutting in the well, if both gates of the blowout preventer are closed, then to determine whether the blowout preventer is fully open, it is necessary to compare whether the well opening flow rate data and the well shut-in flow rate data corresponding to the two gate control circuits are consistent. If the well opening flow rate data in the two control circuits can match its well shut-in flow rate data, then it means that the entire blowout preventer is fully open and the wellhead is in the open state. If the well opening flow rate data and the well shut-in flow rate data in one control circuit do not match, it means that the well opening has failed and the blowout preventer has not been fully opened.

[0062] Step S5. After the control circuits of both sets of gates of the blowout preventer have performed the above well shut-in and well opening operations, if the control system determines that both sets of gates of the blowout preventer have been opened according to the well opening indicator, the entire system returns to step S1 and re-executes the above judgment logic. Otherwise, as long as one set of gates is not opened, it will return to step S3, collect the suspended weight value, and perform braking or releasing operation on the traveling block according to the collected suspended weight value.

[0063] In this embodiment, when well opening fails and the blowout preventer is not fully opened, the control system outputs an alarm message. On-site personnel then go to the wellhead to manually remove the obstruction based on the alarm message, thus manually releasing the brakes on the traveling block.

[0064] In this embodiment, it should also be noted that the logic and principle of determining whether the signal is a valid signal in this step are the same as those in step S3, and will not be repeated here.

[0065] In this embodiment, it should be further explained that the current well opening flow rate data refers to the flow rate of hydraulic oil in the control circuit when the blowout preventer is opened.

[0066] Based on the same inventive concept, embodiments of this application also disclose a drilling tool three-proof safety control device, which is used to implement the drilling safety lifting control method described above, as shown in the appendix to the specification. Figure 1 The control device includes a control system and a weight sensor, a hydraulic sensor, an oil level sensor, an air source solenoid valve, an exhaust solenoid valve, and an air pressure sensor, all connected to the control system. The control system is integrated into a control box, and the control box panel is equipped with a touch-screen human-machine interface display. The weight sensor is located at the pressure transmission bag at the dead rope end of the derrick. The hydraulic sensor and oil level sensor are sequentially installed in the blowout preventer control oil circuit between the hydraulic station and the blowout preventer. The air source solenoid valve, the exhaust solenoid valve, and the air pressure sensor are sequentially installed in the brake control air circuit between the air source and the brake device. The control device also includes a three-color indicator light, which is connected to the control system.

[0067] Furthermore, referring to the accompanying drawings, the blowout preventer control oil circuit includes an upper semi-sealed control oil circuit and a lower semi-sealed control oil circuit. The two semi-sealed control oil circuits have the same structure, both including a hydraulic sensor and an oil quantity sensor arranged sequentially between the hydraulic station and the blowout preventer. The two semi-sealed control oil circuits are respectively connected to the control system and are centrally controlled by the control system.

[0068] In this embodiment, it should be noted that the weight sensor uses a German FIRST SENSOR silicon chip, which has high precision, high stability and high anti-interference capability; the air source solenoid valve is a direct-acting normally closed solenoid valve, which has the advantages of fast response speed and long service life; the three-color indicator light can be set on one side of the control box or directly fixed on the control box body.

[0069] Example 2

[0070] As a supplement and preferred embodiment of the above embodiment 1, in this embodiment, when the control system controls the air source solenoid valve in the brake control air circuit to open and connect the air source, if the air pressure sensor has no signal input, the control system will output a corresponding air source solenoid valve fault signal to prompt the on-site operator.

[0071] Furthermore, if the control system is powered on Within a certain time frame, for example, within 10 seconds of power-on, if the control system can receive the signal input from the hydraulic sensor but fails to receive the signal input from the oil quantity sensor, the control system directly proceeds to step S3 to collect the suspended weight value at this time, and brakes or releases the brake on the traveling carriage based on the suspended weight value.

[0072] Furthermore, if the control system is powered on After a certain period of time, for example, 10 seconds after power-on, if the control system can detect the signal input from the hydraulic sensor but not the signal input from the oil quantity sensor, the control system will directly open the air source solenoid valve to connect the air source, and compressed gas will enter the braking device to lock the traveling block. At the same time, the control system will also output an oil quantity sensor fault signal to alert the operators on site.

[0073] Furthermore, after the well is shut in, if the control system detects an input signal from the oil quantity sensor but cannot confirm whether it is rotating in the forward or reverse direction, the control system will output an oil quantity sensor fault signal. At the same time, the control system will directly open the gas source solenoid valve to connect the gas source, and compressed gas will enter the braking device to brake the traveling block. Then, after receiving the fault signal from the control system, the on-site operator will manually troubleshoot the fault. After the fault is cleared, the control system will release the traveling block brake.

[0074] In this embodiment, it should be noted that both the upper and lower half-sealing control oil circuits of the blowout preventer execute the above sensor fault judgment logic.

[0075] The above description is merely a preferred embodiment of this application and is not intended to hinder this application in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of this application shall fall within the protection scope of this application.

Claims

1. A method for safe tripping control of drilling tools, characterized in that, Includes the following steps: Step S1. Power on the control system and load the operating parameters. The system monitors and acquires data from the hydraulic sensors and oil quantity sensors in the blowout preventer control oil circuit in real time. Step S2. When the blowout preventer (BOP) begins to close, hydraulic oil in the hydraulic station enters the BOP cylinder through the BOP control circuit; the oil quantity sensor in the control circuit rotates forward, and the control system receives the pulse signal transmitted by the oil quantity sensor. Based on the pulse signal, the flow rate of hydraulic oil in the circuit at this time is calculated and it is determined whether the signal is valid. When the signal is valid, the brake control air circuit is opened and the traveling block is locked; when the signal transmitted by the oil quantity sensor does not change, the brake control air circuit is cut off, the traveling block is released from the brake, and finally the control system records the current shut-in flow rate data. Step S3. The control system continuously collects the suspended weight value. If the currently collected suspended weight value is greater than the reference tonnage, the brake control air circuit is opened to brake the traveling carriage; if the currently collected suspended weight value is less than the reference tonnage, the brake control air circuit is cut off and the traveling carriage is released from braking. Step S4. When the blowout preventer begins to open, the hydraulic oil in the blowout preventer cylinder flows back to the hydraulic station through the blowout preventer control oil circuit. The oil quantity sensor in the oil circuit reverses, and the control system receives the pulse signal transmitted by the oil quantity sensor. The system calculates the hydraulic oil flow rate in the oil circuit based on the received signal and determines whether the signal is valid. When the signal is valid, the brake control air circuit is opened and the traveling block is locked. When the signal transmitted by the oil quantity sensor remains unchanged, the current well opening flow rate data is recorded. The control system compares the difference between the current well opening flow rate data and the previous well shut-in flow rate data to see if it is less than the error reference value. If it is less than the error reference value, the control system determines that the blowout preventer has been fully opened, the brake control air circuit is cut off, and the traveling block is released from the brake. If the difference is greater than the error reference value, the control system determines that the blowout preventer has not been opened and outputs an alarm message. The brake control air circuit remains open, and the operator manually opens the blowout preventer and clears the alarm. Step S5. The control system determines whether both sets of blowout preventers have been activated. If so, it returns to step S1; otherwise, it returns to step S3.

2. The tri-proof safety hoisting control method of a drilling rig according to claim 1, characterized in that, The control system continuously collects the suspended weight value during operation. If no suspended weight value signal is collected or the suspended weight value exceeds 1000 tons, the control system outputs a suspended weight sensor fault signal.

3. The method of claim 1, wherein, The brake control air circuit is also equipped with a pressure sensor. When the control system controls the air source solenoid valve in the brake control air circuit to open and connect the air source, if the pressure sensor has no signal input, the control system outputs a fault signal for the air source solenoid valve.

4. The tripping control method of claim 1, wherein, The control system is powered on If the hydraulic sensor signal is detected without the oil amount sensor signal within the predetermined time, the control system proceeds to Step S3.

5. The tripping control method of claim 1, wherein, The control system is powered on After a certain period of time, if the hydraulic sensor signal is detected without the oil sensor signal, the control system directly opens the air source electromagnetic valve to connect the air source, and the compressed gas enters the brake device, while the control system outputs the oil sensor fault signal.

6. The tripping control method of claim 1, wherein, After the well is shut in, the control system detects a signal from the oil level sensor but cannot confirm whether the rotation is forward or reverse. The control system directly opens the air source solenoid valve to connect the air source, and compressed gas enters the braking device. At the same time, the control system outputs a fault signal for the oil quantity sensor.

7. The method of claim 1, wherein, The method for determining the valid signal is as follows: within a certain period of time, if the control system calculates that the oil quantity data in the oil circuit has not reached the set threshold based on the signal transmitted by the oil quantity sensor, then the signal transmitted by the oil quantity sensor is considered an invalid signal; if the control system calculates that the oil quantity data in the oil circuit exceeds the set threshold based on the signal transmitted by the oil quantity sensor, then the signal transmitted by the oil quantity sensor is considered a valid signal.

8. A drilling tool tripping safety control device for implementing the drilling tool tripping safety control method according to any one of claims 1 to 7, characterized in that, The system includes a control system and a suspension sensor, a hydraulic sensor, an oil quantity sensor, an air source solenoid valve, an exhaust solenoid valve, and an air pressure sensor, all connected to the control system. The suspension sensor is located at the pressure transmission bag at the dead rope head of the derrick. The hydraulic sensor and the oil quantity sensor are sequentially located in the blowout preventer control oil circuit between the hydraulic station and the blowout preventer. The air source solenoid valve, the air pressure sensor, and the exhaust solenoid valve are sequentially located in the brake control air circuit between the air source and the brake device.

9. The tri-proof safety tripping control device of claim 8, wherein, The control system is integrated in a control box, and the control box panel is equipped with a touch-screen human-machine interface display.

10. The tri-proof safety tripping control device of claim 8, wherein, It also includes a three-color indicator light, which is connected to the control system.

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